So, my story may sound familiar to others. In late high-school and college I had a lot of angst. Suicidal, depressive angst, lots of poor decisions, mood swings galore, and even a lack of attention, even in some of my most exciting classes.
Then we found out my family is predisposed to celiac. And that I had it.It wasn't an overnight change. But I will say, as I have finally begun to heal my leaky gut and other celiac-related issues (not just my gut, but almost everything it seems), my mound mood became a lot sounder too.
Another anecdote proved that for me. I had a bed gluten exposure, and not only did I have physical symptoms, but also memory loss, depression, etc. If I'd said or done something for a couple of days after, it didn't feel like me doing it. And it wasn't pretty.
I don't want to totally blame gluten. But I do think that in time science will discover psychological effects of toxins like gluten.